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Volumn 131, Issue 38, 2009, Pages 13860-13869

Anti-selective catalytic asymmetric nitroaldol reaction via a heterobimetallic heterogeneous catalyst

Author keywords

[No Author keywords available]

Indexed keywords

ACTIVE CATALYST; CATALYST PREPARATION; CATALYTIC PERFORMANCE; ENANTIOSELECTIVE; HETERO BIMETALLIC COMPLEXES; HETEROBIMETALLICS; HETEROGENEOUS CATALYST; HETEROGENEOUS CONDITIONS; HETEROGENEOUS MIXTURES; HIGH RESOLUTION; NITROALDOL; NITROALKANES; X RAY FLUORESCENCE ANALYSIS;

EID: 70349747004     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja905885z     Document Type: Article
Times cited : (125)

References (124)
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    • note
    • 3 aggregate or serve as an additional ligand to Nd to acquire a more suitable chiral environment for the reaction. See also ref 24.
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    • note
    • 13/1b/NaHMDS/aldehyde ) 1.8 μ mol/18 μmol/18 μmol/300 μmol, Nd/1b/Na/aldehyde = 9/18/18/300 = 1/2/2/33.3.
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    • note
    • Indeed, a DFT calculation suggested that the rotational conformer A (dihedral angle ca. 0°) was much more stable than that of B (dihedral angle ca. 180°) in ligand 1h, whereas 1g displayed a small energy difference between rotational conformers A and B. The energy profile of the C-C bond rotation in a m-hydroxybenzoyl ester analogue was similar to that of 1h, suggesting that the predominance of rotational conformer A (dihedral angle ca. 0°) in 1h was due to the C-F⋯H-N hydrogen bond. See the Supporting Information for details.
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    • Installation of multiple fluorine substitutes may weaken C-F⋯H-N hydrogen bonding, disfavoring the coplanarity of the aromatic ring and planar amide. See also ref 20e.
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    • note
    • 2O.
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    • The precipitate was washed by two cycles of the following procedure: (1) re-suspended with dry THF; (2) mixed by vortex mixer; (3) centrifuged; and (4) decantation of supernatant. See the Supporting Information for details.
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    • See the Supporting Information for details.
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    • note
    • This is presumably because an excess amount of ligand 1m was essential for effective nucleation of the precipitate through bridging Nd and Na cations. 1m on the surface of the heterogeneous catalyst might be washed away. Excess 1m could be recovered from the supernatant.
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    • note
    • Comparison of observed and theoretical isotopic pattern of the prominent peaks was shown in the Supporting Information.
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    • note
    • 1H NMR), anti/syn = 21/1, 86% ee (anti)).
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    • note
    • The precipitate was washed by four cycles of the following procedure: (1) re-suspended with dry THF; (2) mixed by vortex mixer; (3) centrifuged; and (4) decantation of supernatant. See the Supporting Information for details.
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    • note
    • Low chemical yield would be due to the competitive protonation by phenol functionality of additional ent-1m. Low reaction rate was observed when phenolic additives were employed in this catalytic system.
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    • note
    • 13. See the Supporting Information for details.
  • 115
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    • note
    • At higher temperatures (higher than -20°C), retro-nitroaldol reaction proceeded depending on the substrate used and may decrease the stereoselectivity.
  • 116
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    • note
    • Additional 1 mol % of NaHMDS would scavenge the trace amount of acid included in benzaldehyde (2a) without affecting the stereoselectivity.
  • 117
    • 70349728432 scopus 로고    scopus 로고
    • note
    • 1H NMR) of the product 4ab in anti/syn = 3.2/1 and 41% ee (anti). This is likely due to the fact that the catalytically active Nd/Na heterobimetallic catalyst would not be formed with 3b even in the solution phase.
  • 118
    • 70349740959 scopus 로고    scopus 로고
    • note
    • 1H NMR spectrum of the crude mixture, the signals derived from 4aa or 4ea were not observed. Nitroethane (3a) incorporated in the heterogeneous catalyst may be reluctant to be replaced with bulkier nitroalkanes. If initially incorporated nitroethane (3a) reacted with an aldehyde, the amount of the nitroaldol product derived from 3a would be negligible with low catalyst loading.
  • 119
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    • note
    • In the reaction using 3c in THF, the heterogeneous catalyst dissolved and the reaction mixture became a clear solution, affording the product with slightly lower stereoselectivity.
  • 120
    • 70349751595 scopus 로고    scopus 로고
    • note
    • 13/1m/NaHMDS = 1/2/1.75 ratio gave the best performance.
  • 123
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    • JP Patent JP 2002-64840; see also ref 10b
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    • note
    • 2O was used as catalyst, -30°C, THF, 10 equiv of 3a). The yield and stereoselectivity at the specified period of the reaction time were as follows: 3 h, 55% yield, anti/syn = >40/1, 97% ee (anti); 6 h, 72% yield, anti/syn ) >40/1, 98% ee (anti); 12 h, 86% yield, anti/syn = 34/1, 97% ee (anti); 18 h, 89% yield, anti/syn = 31/1, 96% ee (anti); 24 h, 92% yield, anti/syn = 29/1, 96% ee (anti). At temperatures higher than -30°C and with higher catalyst loading (2 mol %), the retro-nitroaldol reaction competitively occurred to decrease the stereoselectivity slightly.


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